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Foxtel to run anti-gay marriage ad

Foxtel could face a backlash from subscribers over its decision to broadcast a commercial against same-sex marriage. Fairfax Media is also running this ad.

Customers have been telling Foxtel they will cancel their subscriptions on Monday and leaving rude emojis on Foxtel's Facebook site.

In among questions about bundle bills and where they can watch The Walking Dead, viewers have also left messages like, "disgusted you gave voice to such a shameful and discriminatory ad for the Marriage Alliance".

Foxtel, which has signed a corporate campaign in support of same-sex marriage and has been airing ads for the pro-same-sex marriage lobby since the weekend, has further angered some customers with its justification for airing the ads.

"This decision was not made lightly and was made with the active involvement of senior gay executives," it posted on Facebook.

"We believe this debate should be won by the force of the argument in favour of reform, not by refusing to engage in debate or to allow contrary opinions to be put."

As one viewer posted in response, "stop spreading that stupid message".

The Marriage Alliance is a newly-formed group that describes itself as independent.

The campaigns for and against same-sex marriage are intensifying as MPs prepare to lodge a cross-party bill to legalise same-sex marriage with the House of Representatives Tables Office on Tuesday.

High-profile Australians, including AFL players Josh Bruce and Matt Spangher, actor Hugo Weaving and television news reader Chris Bath are featuring in ads in support of same-sex marriage, calling on Parliament to stop stalling on the issue.

On Monday, the anti-same-sex marriage group, Australian Marriage Forum, took out a full page ad in The Australian newspaper, arguing that "all relationships matter. But not all relationships are Marriage".